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add framework for mmap2 syscall unit to vary by arch

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This commit is contained in:
Rich Felker 2014-07-30 23:24:31 -04:00
parent cc54f0aeba
commit b5bbe79749
2 changed files with 7 additions and 2 deletions
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4
src/internal/syscall.h
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@ -8,6 +8,10 @@
#define SYSCALL_RLIM_INFINITY (~0ULL)
#endif
#ifndef SYSCALL_MMAP2_UNIT
#define SYSCALL_MMAP2_UNIT 4096ULL
#endif
#ifndef __scc
#define __scc(X) ((long) (X))
typedef long syscall_arg_t;

5
src/mman/mmap.c
View File

@ -11,7 +11,8 @@ static void dummy0(void) { }
weak_alias(dummy1, __vm_lock);
weak_alias(dummy0, __vm_unlock);
#define OFF_MASK ((-0x2000ULL << (8*sizeof(long)-1)) | 0xfff)
#define UNIT SYSCALL_MMAP2_UNIT
#define OFF_MASK ((-0x2000ULL << (8*sizeof(long)-1)) | (UNIT-1))
void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
{
@ -27,7 +28,7 @@ void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
}
if (flags & MAP_FIXED) __vm_lock(-1);
#ifdef SYS_mmap2
ret = (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off>>12);
ret = (void *)syscall(SYS_mmap2, start, len, prot, flags, fd, off/UNIT);
#else
ret = (void *)syscall(SYS_mmap, start, len, prot, flags, fd, off);
#endif